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Author Topic: Chimaera - The story continues  (Read 1844 times)

jpdenver

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Re: Chimaera - The story continues
« Reply #25 on: July 11, 2020, 09:33:42 pm »

Mark,Thank you for your kind words. 
 I appreciate that my attempts at craftsmanship are recognized by others with so much more experience than I. 

Everyone -

I have a decision to make. 

1. Do I cover the damage up and do a full refinish to hide it and pretend it never happened?
OR
2. Do I repair the damage as if it was a full size ship, and end up with a riveted Painted copper sheathing/patch.   
and a story to tell about a boiler explosion? 

I know that a lot of you go to great lengths to age your models and give realism to the "history"
What do you think I should do with the Chimaera? 

Thanks for reading, 
Jim
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Capt Podge

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Re: Chimaera - The story continues
« Reply #26 on: July 11, 2020, 09:48:45 pm »

I would go for option #2. If it doesn't work out, then you can always return to option #1.  O0


Regards,
Ray.
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boulderboater

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Re: Chimaera - The story continues
« Reply #27 on: July 11, 2020, 11:34:26 pm »

Jim,
I looked up "ideal diodes", which are in fact MOSFETs, that would keep your batteries isolated in future. The one I found, 2 diodes rather than a bridge, have forward voltage drop at 15A of 0.075V.  Not a very high current rating, but here is an example: Traditional diode at 15A drops 0.6v and cooks at (15)x(0.6) = 9Watts, whereas the ideal type consume (15)x(0.075) =1.125Watts - meaningfully lower power and voltage loss, and less chance that they themselves will initiate a heat problem.
The ideal diodes are at MPJA.com  (or Marlin P Jones as was) and are $5 including heat sink!! Stock No: 35486 DI. I will keep serching for a higher rated set.Cheers, Paul
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jpdenver

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Re: Chimaera - The story continues
« Reply #28 on: July 16, 2020, 11:10:17 pm »

Hello again,
I had to take some time to satisfy my day job, 
they still keep me around and want to pay me so I need to actually work once in a while. 

I started to repair the hull.

First was to re-enforce the interior.
Here in the US we have a product that is a FiberGlass infused body putty.I use it to "encase and seal" 
- usually things like prop tubes or motor mounts.

It works really well. 

So I lined the inside of the hull behind the patch and ribs. 

Then I coated the outside of the hull patch with Epoxy Resin. 

When this sets up, I will work on a final "Skin" of copper.




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derekwarner

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Re: Chimaera - The story continues
« Reply #29 on: July 16, 2020, 11:21:19 pm »

Interesting Jim  :o ...even after abrading the surface of the copper sheet, how do you adhere anything the sheet surface ?...... Derek
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Derek Warner

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jpdenver

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Re: Chimaera - The story continues
« Reply #30 on: July 17, 2020, 02:56:42 am »

Derek,
Not a clue.

I am making this up as I go along.Seriously, I will have to think about this.

I may end up laminating another layer of birch ply (1/16") and then add the "rivets"which are actually known as Gimp Nails. 
Little nails with a rounded head. 

Or maybe building up with epoxy and sanding the whole thing smooth.
Still playing with ideas.

Thanks for reading. 
Jim
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Mark T

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Re: Chimaera - The story continues
« Reply #31 on: July 17, 2020, 06:57:06 am »

Hi Jim it looks like you have stabilised the hole with a strong repair. You could always now place planks using epoxy on the plywood to bring the hull level and the fill and sand it smooth. If you then repainted it would be invisible

jpdenver

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Re: Chimaera - The story continues
« Reply #32 on: July 19, 2020, 10:20:37 pm »

So ----
I decided to just repair and repaint it the best I can,   
without trying to emulate a repair. 

Filled it in,  sanded,  primed,   sanded,   painted,   scuffed  -  and finally added back the waterline.
Result, 

The hull lines are pretty close to original. 
There is a slight sheen difference, but the first time she scrapes the hull against a dock that will not matter. 

Now to rebuild the interior and the deck. 

I might get her on the water in a month if I get the time. 








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